High speed steel



Patented Aug. 7, 1934 PATENT OFFICE messes HIGH SPEED STEEL Joseph Kent Smith, Detroit, Mich assign" a The Beryllium Corporation, New York, N. Y a corporation of Delaware No Drawing. Application August 10, 1931-. Serial No. 556,325

1 Claim. (01. 75-1 This invention relates to a series of compositions of steel, classifiable as "high-speed steel", and characterized by the presence, among other alloying elements, of metallic beryllium.

Standard high-speed steels of today consist of ironalloys with carbon varying from 0.2% to 0.7%, tungsten, from about 12% to 22% (with whole 'or partial replacement by molybdenum, a weight unit of tungsten being replaceable by half a weight unit of molybdenum), chromium up to 7% and, .optionally, a vanadium content up to 2%. These are in addition to the usual steel constituents and contaminants-silicon, manganese, sulphur, etc.- The term high-speed steel, as used in this application, is to be considered as representing compositions included in the analyses, above, and is to be so under stood in the claim. Y

its common contaminants.

I have found that the addition-of beryllium, in quantities'not more than 5% of the total, and over 0.2% is of great benefit to high speed steels of this type. Particularly valuable is the increasing of the red hardness of the steelwhich the beryllium confers. Because of this greater hardness', the life of the steel is materially increased under operating conditions, and, as a corollary, greater cutting power is conferred upon tools made from steel'of such composition.

I -claini1'- A high speed steel comprising carbon from about 0.2% to about 0.7%, tungsten from about 12% to 22%, chromium from a substantial irac- 70 tion of,1% up to about 7%, beryllium from about 0.2% to about 5%, and the balance iron with J. KENT SW. 

